Manifest destiny. They believed it was their god given right to expand westward.
God made the wrath of man to praise him when he hardened Pharaoh's heart to make him chase the Israelites, so he could save his people led by Moses by parting the Red Sea for them to cross to the other side and then drowning the Egyptians in it.
"<em>And I will harden Pharaoh's heart, that he shall follow after them; and I will be honored on Pharaoh, and on all his host; that the Egyptians may know that I am the LORD. And they did so.</em>" - Exodus 14:4.
It was the
Missouri Compromise
Answer:
He accused Germany of sinking unarmed boats. As for the second question you have to answer that yourself. Basically starting a war isn't good, but you need a way of putting down and showing your dominance if your military is being threatened.